Zoom via scroll wheel using DoTween

CameraZoom.cs

using System;
using DG.Tweening;
using DG.Tweening.Core;
using DG.Tweening.Plugins.Options;
using UnityEngine;

public class CameraZoom : MonoBehaviour
{
    [SerializeField] private new Camera camera;
    [SerializeField] private Ease easeType = Ease.InOutExpo;
    [SerializeField] private float animationDuration = 1f;
    
    [SerializeField] private float maxZoom = 120f;
    [SerializeField] private float minZoom = 25f;
    
    private float _targetFov;
    private TweenerCore<float, float, FloatOptions> _tween;

    private void OnValidate()
    {
        // If we don't have a camera, skip this!
        if (Camera.main == null)
        {
            Debug.LogError("No main camera found");
            return;
        }

        // Find camera automatically and cache it
        camera = Camera.main;
    }

    private void Start()
    {
        // Set our target as what our camera is currently set to
        _targetFov = camera.fieldOfView;
    }

    private void Update()
    {
        // if we don't have a camera, don't do anything
        if (!camera) return;
        TweenCameraByMouseScrollPosition();
    }

    private void TweenCameraByMouseScrollPosition()
    {
        var mouseInput = UnityEngine.Input.GetAxis("Mouse ScrollWheel");
        if (mouseInput != 0)
        {
            // Clamp target zoom
            _targetFov = Mathf.Clamp(mouseInput + _targetFov, minZoom, maxZoom);
            
            // Clean up old tween if it exists
            if (_tween != null && _tween.IsActive())
            {
                _tween.Kill();
            }
            
            _tween = camera.DOFieldOfView(_targetFov, animationDuration).SetEase(easeType);
        }
    }
}